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What's the "DNS_BLOCK_ASSERTIONS" (C compiler flag)?
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Compile-time flags are boolean values provided through the compiler via a macro method. They allow to conditionally include or exclude code based on compile time conditions. There are several default flags provided by the compiler with information about compiler options and the target platform.
When compiling a pattern string into a pattern object, it's possible to modify the standard behavior of the patterns. In order to do that, we have to use the compilation flags.
The NS_BLOCK_ASSERTIONS macro (no "D") suppresses the checks performed by NSAssert. You supply it to the compiler using -DNS_BLOCK_ASSERTIONS (see the comments for an explanation of the "D").
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